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Sight unseen, I don't recommend anything. To run three model 3500 heads, you probably don't need the full output of the HJ100S. I have installed the Myers jet pumps before, so I know they are a reliable product.

here's a question - what's the power to your pump - you do know that a 1HP 'pro' pump is going to pop circuit breakers on a 120-volt line

So what are the specs on your 3500 heads? I don't install them (don't install any mini-rotor heads)

Here is another worthy line of jet pumps, the JS series by Goulds. I include this, because I don't see the equivalent info on the Myers website. You may find that a good 1/2 HP jet pump will work after all. Understand, though, that you can't fudge the numbers, and also understand that any pressure losses in the suction pipe plumbing have to be converted to additional suction lift.